This is a small tutorial on how to download the embedded videos of Wordpress video plugin.
Actually I discovered this when a friend of mine asked me to download important videos from a Wordpress based website. So this was the hack:

Now we need to know how that URL is being parsed on the server and then loaded in our browser. We notice that gidparameter which is in our case "mi8XL1TI" (Every video has a gid).

Now after tampering the HTTP requests while the video is beginning to load, we figure out that the file responsible for parsing the requests and loading the videos is:http://v.wordpress.com/wp-content/plugins/video/video-xml.php

Now all we need to do is to pass the gid of our video as parameter to for this file:http://v.wordpress.com/wp-content/plugins/video/video-xml.php?guid=mi8XL1TI

Voila! All the information about the video is showed in an XMLstyle! Now all what we need to do is to check the tag called "movie_file" to find the video source.

The source file for this video is:http://cdn.videos.wordpress.com/mi8XL1TI/embedding-youtube-h264_dvd.mp4